From 12c5acd287b582a4509ff297fa1606e3aaddf06c Mon Sep 17 00:00:00 2001
From: gorhill <rhill@raymondhill.net>
Date: Sat, 15 Aug 2015 14:20:49 -0400
Subject: [PATCH] this fixes #325

---
 platform/firefox/frameModule.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/platform/firefox/frameModule.js b/platform/firefox/frameModule.js
index 2e0d6a3..a01cb18 100644
--- a/platform/firefox/frameModule.js
+++ b/platform/firefox/frameModule.js
@@ -188,7 +188,10 @@ const contentObserver = {
                 win.document.title.slice(0, 100)
             ].join(' | ');
 
+            // https://github.com/gorhill/uMatrix/issues/325
+            // "Pass sameZoneAs to sandbox constructor to make GCs cheaper"
             sandbox = Cu.Sandbox([win], {
+                sameZoneAs: win.top,
                 sandboxName: sandboxId + '[' + sandboxName + ']',
                 sandboxPrototype: win,
                 wantComponents: false,